import { click, mouseOnly } from 'ol/events/condition';
import { Select } from "ol/interaction"
import { transform } from 'ol/proj'

/**
 * Mercator transform 84
 * @param e []
 * @returns 
 */
export const Clonlat = (e) => {
    return transform(e, 'EPSG:3857', "EPSG:4326")
}
/**
 * 84 transform Mercator
 * @param e []
 * @returns 
 */
export const CMercator = (e) => {
    return transform(e, "EPSG:4326", 'EPSG:3857')
}

export const selectclick = new Select({
    condition: click,
});

export const selectmouseOnly = new Select({
    condition: mouseOnly,
});



/**
 * Gets the latitude and longitude of the mouse
 */
export const mouseLngLat = (e, map) => {

    let layerX = e[0];
    let layerY = e[1];
    let MaxX = document.body.clientWidth, MaxY = document.body.clientHeight;
    let ViewLngLat = map.getView().calculateExtent(map.getSize());

    let lat = (ViewLngLat[3] - ViewLngLat[1]) * (layerY / MaxY) + ViewLngLat[1];
    let lng = (ViewLngLat[2] - ViewLngLat[0]) * (layerX / MaxX) + ViewLngLat[0];
    return [lng, lat]
}


/**
 * 高德坐标转84
 * Souse = {
 * 
 * lon,
 * lat,
 * parameter [x,y]
 * }
 * 
 */

var PI = 3.14159265358979324;
export const transformGCJ2WGS = (Souse) => {

    if (Array.isArray(Souse.parameter) && Souse.parameter.length === 2) {
        let d = delta(Souse.lon, Souse.lat, Souse.parameter);
        return [Souse.lon - d.lat, Souse.lat - d.lon]
    } else {
        let d = delta(Souse.lon, Souse.lat, [1, 1]);
        return [Souse.lon - d.lat, Souse.lat - d.lon]
    };

}

function delta(lat, lon, par) {
    let a = 6378245.0 //  a: 卫星椭球坐标投影到平面地图坐标系的投影因子。
    let ee = 0.00669342162296594323 //  ee: 椭球的偏心率。
    let dLat = transformLat(lon - 105.0, lat - 35.0)
    let dLon = transformLon(lon - 105.0, lat - 35.0)
    let radLat = lat / 180.0 * PI
    let magic = Math.sin(radLat)
    magic = 1 - ee * magic * magic
    let sqrtMagic = Math.sqrt(magic)
    dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * PI)
    dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * PI)
    return {
        'lat': dLat / (par[0] ? par[0] : 1),
        'lon': dLon * (par[1] ? par[1] : 1)
    }
}
function transformLat(x, y) {
    let ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x))
    ret += (20.0 * Math.sin(6.0 * x * PI) + 20.0 * Math.sin(2.0 * x * PI)) * 2.0 / 3.0
    ret += (20.0 * Math.sin(y * PI) + 40.0 * Math.sin(y / 3.0 * PI)) * 2.0 / 3.0
    ret += (160.0 * Math.sin(y / 12.0 * PI) + 320 * Math.sin(y * PI / 30.0)) * 2.0 / 3.0
    return ret
}
function transformLon(x, y) {
    let ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x))
    ret += (20.0 * Math.sin(6.0 * x * PI) + 20.0 * Math.sin(2.0 * x * PI)) * 2.0 / 3.0
    ret += (20.0 * Math.sin(x * PI) + 40.0 * Math.sin(x / 3.0 * PI)) * 2.0 / 3.0
    ret += (150.0 * Math.sin(x / 12.0 * PI) + 300.0 * Math.sin(x / 30.0 * PI)) * 2.0 / 3.0
    return ret
}


